![]() ![]() The experimental setup from the TN111 is a typical example using this topology. Variable speed drive topology with a unidirectional DC source and a braking chopper The figure below illustrates how the various parts of the variable speed drive can be rack-mounted into a cabinet for ease of use. This interface features extensive connectivity for position, temperature, and torque measurements, as well as all the necessary signal conditioning and power supplies required by these external sensors. The functionalities of the controller can be extended for drive applications by the Motor Interface for B-Box RCP. In case an overvoltage or overcurrent is detected, the PWM outputs are immediately disabled and the machine is safely de-energized. It features dedicated hardware protection circuits linked to its analog inputs. On the control side, the converter is controlled by a B-Box RCP programmable controller. While imperix does not manufacture reversible DC sources, it can provide off-the-shelf power supplies from a third-party manufacturer. ![]() Each power module features a set of capacitors on the DC side, as well as built-in measurements of the DC bus voltage and line current. Imperix recommends using PEB8038 modules rather than PEB8024 because their longer rise and fall times result in lower transient overvoltages. This phenomenon wears out the insulation and shortens the life of the machine. Thus, the semiconductors produce a transient over-voltage at every switching event, which may lead to leakage currents flowing through the insulation of the windings (partial discharge). Indeed, the power cables of the machines have a parasitic RLC component. However, there are additional criteria to consider for motor applications: the rise and fall times of the semiconductors. At first glance, only the current rating differentiates both modules. The power stage can be built using half-bridge power modules such as the PEB8024 and PEB 8038. Topology of a variable speed drive a reversible DC source and a VSI ![]()
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